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chhlorodifluoromethane known as r22 freon 22 is similar to dichlorodifluoromethane r12 except for higher run temperature and pressure is used in household air conditioning systems commercial air conditioning and refrigeration although r22 hydrochlorofluorocarbon less damaging to the ozone layer than r12 r22 is being phased out due to concern over ozone layer damage
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